<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        table {
            width: 800px;
            margin: 100px auto;
            text-align: center;
            border-collapse: collapse;
        }
        
        thead tr {
            background-color: aquamarine;
            font-size: 18px;
            color: black;
            font-weight: 300;
        }
        
        tbody tr {
            color: blue;
            font-size: 14px;
            border-bottom: 1px solid #d7d7d7;
        }
        
        .bg {
            background-color: pink;
        }
    </style>
</head>

<body>
    <table>
        <thead>
            <tr>
                <th>代码</th>
                <th>名称</th>
                <th>最新公布净值</th>
                <th>累计净值</th>
                <th>前单位净值</th>
                <th>净值增长率</th>
            </tr>
        </thead>

        <tbody>
            <tr>
                <td>003526</td>
                <td>三个月定期开放</td>
                <td>1.075</td>
                <td>1.079</td>
                <td>1.074</td>
                <td>+0.047%</td>
            </tr>
            <tr>
                <td>003526</td>
                <td>三个月定期开放</td>
                <td>1.075</td>
                <td>1.079</td>
                <td>1.074</td>
                <td>+0.047%</td>
            </tr>
            <tr>
                <td>003526</td>
                <td>三个月定期开放</td>
                <td>1.075</td>
                <td>1.079</td>
                <td>1.074</td>
                <td>+0.047%</td>
            </tr>
            <tr>
                <td>003526</td>
                <td>三个月定期开放</td>
                <td>1.075</td>
                <td>1.079</td>
                <td>1.074</td>
                <td>+0.047%</td>
            </tr>
            <tr>
                <td>003526</td>
                <td>三个月定期开放</td>
                <td>1.075</td>
                <td>1.079</td>
                <td>1.074</td>
                <td>+0.047%</td>
            </tr>
            <tr>
                <td>003526</td>
                <td>三个月定期开放</td>
                <td>1.075</td>
                <td>1.079</td>
                <td>1.074</td>
                <td>+0.047%</td>
            </tr>


        </tbody>
    </table>
    <script>
        // 1.用到鼠标事件 鼠标经过onmouseover 鼠标离开onmouseout
        // 2.核心思路：鼠标经过tr行，当前的行便背景颜色，鼠标离开取掉当前的背景颜色
        // 3.注意第一行（thead里面的行）不需要变换颜色，因此我们获得的是tbody里面的行

        // 1.获取元素
        var trs = document.querySelector('tbody').querySelectorAll('tr');
        // 2.利用循环绑定事件
        for (var i = 0; i < trs.length; i++) {
            //鼠标经过事件
            trs[i].onmouseover = function() {
                    this.className = 'bg';
                }
                // 鼠标离开事件
            trs[i].onmouseout = function() {
                this.className = '';
            }

        }
    </script>
</body>

</html>